Actually any quality gas engine oil is "low ash" oil. Its just a matter of which has lower ash. Years ago I looked and Castrol GTX 30W had a lower ash content the "IH" oil along with a couple of other brands - formulations have changes since then so I don't know what is rated where today. IH just used it in marketing its oil. Most Group 4 synthetic oils have extremely low levels of sulfated ash - much lower than the advertised "Low Ash" CIH oil.
All gas engines benefit from low ash oil - not just IH engines.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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